Out-mold decoration process method adopting magnetic effect

Abstract

The invention belongs to the technical field of surface decoration processes, and particularly relates to an out-of-mold decoration process method adopting a magnetic effect. The resin in the magnetic ink is mainly prepared from acrylic resin, vinyl chloride-vinyl acetate resin and the like with good stretchability, so that the problem that the ink is easy to crack in an OMD process is solved. In the OMD process, the vacuum pumping temperature can reach-0.1 MPA, and the heating temperature can reach 80-160 DEG C. After a magnetic ink diaphragm and an injection molding part are subjected to vacuum hot-pressing lamination, ink is sealed between the injection molding part and a base film, and a residual solvent of the magnetic ink is easy to boil and cannot be released under a low-pressure condition to cause blistering and cause appearance blistering defects. The invention solves the problems of poor stretchability, cracking, bubbling and the like in the application of the magnetic ink in the OMD process.

Description

Technical Field

[0001] The invention belongs to the technical field of surface decoration technology, and in particular relates to an out-of-mold decoration process method using a magnetic effect. Background Art

[0002] The magnetic texture decoration process is an innovative decoration process that combines magnetic ink and magnetic field control technology. It is widely used in home appliances, electronic products, automotive interiors and other fields. The magnetic texture decoration process uses the magnetic particles in the magnetic ink to be oriented under the action of an external magnetic field to form a texture pattern with a three-dimensional and dynamic feel. The core of this process is to control the distribution of magnetic particles through a magnetic field to achieve a variety of decorative effects.

[0003] Magnetic ink is usually composed of magnetic materials (such as iron oxide, superparamagnetic powder), resin, solvent and auxiliary additives. Magnetic ink is applied to the surface of the substrate to form a printed layer. The coated substrate is placed on the magnetic fixture, and the magnetic particles are oriented and arranged by the magnetic field to form the desired texture. The printed layer is dried or cured to fix the texture. Further surface treatment is performed as needed, such as hard coating, UV (ultraviolet light) curing, etc.

[0004] The magnetic texture decoration process can achieve a variety of unique decorative effects. Through magnetic field control, a three-dimensional texture such as ripples, concentric circles, hairline patterns, etc. is formed. The arrangement of magnetic particles in the magnetic field can give the texture a dynamic sense and enhance the visual effect. The magnetic ink itself has color, and combined with the magnetic field distribution, it can form a texture with depth of field and smart effects. Through magnetic field control, highly personalized design patterns can be achieved. No complex chemical treatment is required during the process, reducing VOC (volatile organic compound) emissions. Compared with traditional decoration processes, the magnetic texture decoration process has a lower production cost. The process is simple and suitable for large-scale production.

[0005] The magnetic effect is generally achieved through coatings / inks containing magnetic pigments. During the drying and curing process, the magnetic pigments are rearranged into the required pattern through the pattern designed by the magnetic fixture using the principle of like attracts like and opposites repel each other. The pattern is determined by the arrangement of the magnetic fixture. The magnetic effect is used in spraying and printing in the home appliance, home improvement and other industries because of its three-dimensional, dynamic and diverse patterns. If it is used for spraying, since a magnetic fixture is required for each workpiece spraying, if the output is high, many sets of magnetic fixtures are required, resulting in high costs that affect its promotion and applicability. If the magnetic effect is made on the diaphragm, the magnetic ink is rolled and printed on the diaphragm, and a set of magnetic fixtures are used to complete the mass production of magnetic diaphragms. In this way, fewer magnetic fixtures are used, the cost is easy to control, and there are more application scenarios.

[0006] The OMD (Out Mold Decoration) decoration process is to soften the diaphragm and the attached ink at a temperature of 80-160℃, and then bond them to the plastic part under a pressure of 0.1MPa-0.4MPa. During bonding, the diaphragm and the attached ink are stretched by about 140%-200%. The main resin in the commonly used magnetic ink has no stretchability.

[0007] At the same time, the OMD (Out Mold Decoration) decoration process is currently widely used on PVC / ABS / PC / PO and other material films. The pattern effect is mainly determined by embossing and printing rollers, which is relatively simple and lacks dynamic effects. Due to the heating, vacuuming and stretching in the OMD process, traditional magnetic inks may have problems such as poor adhesion, cracking and blistering when used in the OMD process.

[0008] CN201810766794.0 discloses a method for forming patterns through magnetic ink and magnetic field control, which is suitable for the decoration of various substrates. CN118200423A realizes the magnetic texture and optical effect of the back cover of the mobile phone through magnetic ink and magnetic field control, solving the problem of appearance defects in traditional processes. Summary of the invention

[0009] Currently, there is no process for applying magnetic ink to OMD. This technology combines magnetic ink with the OMD process, and adheres the magnetic effect film to different types of injection molded parts through the OMD process to achieve different three-dimensional dynamic effects.

[0010] In order to solve the above-mentioned technical problems, this application provides the following technical solutions:

[0011] The present invention provides an out-of-mold decoration process method using a magnetic effect, comprising the following steps:

[0012] S11: coating a magnetic effect ink on one surface of the polymer film;

[0013] S12: forming a magnetic texture on the polymer film coated with the magnetic effect ink in step S11 through a magnetic fixture;

[0014] S13: baking the polymer film formed with corrugations in step S12;

[0015] S14: coating the side of the polymer film coated with the magnetic effect ink after the primary baking with the base color ink and then performing a secondary baking;

[0016] S15: coating glue on the side of the polymer film coated with the base color ink after the secondary baking;

[0017] S16: The side of the polymer film coated with glue is adhered to the surface of the injection molded part through pressure difference molding, thereby completing the out-of-mold decoration process method using magnetic effect.

[0018] The base color ink was purchased from Huaian Yincai, model HC-4688.

[0019] The model of the glue is hot melt glue Kanglibang KL-18.

[0020] Preferably, the material of the polymer membrane is selected from polyvinyl chloride (PVC), ABS (a terpolymer of acrylonitrile, butadiene and styrene), polycarbonate (PC) or polyolefin (PO).

[0021] Preferably, the magnetic effect ink comprises, by weight, 20-40 parts of acrylic resin, 50-70 parts of vinyl chloride-vinyl acetate resin, 2-4 parts of iron oxide magnetic powder, 5-10 parts of ethyl acetate, 5-10 parts of butanone and 1-2 parts of additives.

[0022] Preferably, the magnetic texture is selected from a water ripple magnetic texture or a strip texture.

[0023] Preferably, in step S13, the baking temperature is 55-65° C. and the baking time is 15-30 min.

[0024] Preferably, in step S14, the secondary baking temperature is 55-65° C., and the baking time is 60-120 min.

[0025] Preferably, in step S15, the glue is applied and then baked at 60° C. for 5-10 minutes.

[0026] Preferably, in step S16, the pressure differential molding adopts a vacuum pressure differential laminating machine.

[0027] Preferably, in step S16, the temperature of the differential pressure molding is 80-160°C.

[0028] Preferably, in step S16, the pressure of the differential pressure molding is 0.1-0.4 MPa.

[0029] The present invention also provides an out-of-mold decoration workpiece prepared by the out-of-mold decoration process method using the magnetic effect.

[0030] Due to the heating, vacuuming and stretching in the OMD process, the traditional magnetic ink used in the OMD process will have problems such as poor adhesion, cracking and blistering. The present invention meets the requirements of heating, vacuuming and four-sided stretching in the OMD process by selecting the resin and solvent in the ink. The main resin in the common magnetic ink has no stretchability. The resin in the magnetic ink of the present invention is mainly selected by selecting some acrylic resins, vinyl chloride-vinyl acetate resins and other resins with good stretchability. After the magnetic ink diaphragm and the injection molded part are vacuum hot-pressed, the ink is enclosed between the injection molded part and the base film. The solvent needs to be selected as a quick-drying solvent, and slow-drying solvents such as propylene glycol methyl ether acetate (PMA) and propylene glycol butyl ether (PNB) should be avoided. Because the solvent in the ink dries too slowly, if the baking is not sufficient, the solvent will remain in the ink. After the ink is coated with glue, the solvent is enclosed in the ink. In the OMD process, vacuuming can reach -0.1MPA, and heating can reach 80-160 degrees. The residual solvent in the ink is easy to boil and cause blistering. The magnetic ink in the present invention needs to appropriately extend the baking time and temperature to reduce the solvent residue.

[0031] The technical solution of the present invention has the following advantages compared with the prior art:

[0032] The OMD (Out Mold Decoration) decoration process is to soften the diaphragm and the attached ink at a temperature of 80-160 degrees, and then fit the molded part under a pressure of 0.1MPA-0.4MPA. During the bonding, the diaphragm and the attached ink are stretched by about 140%-200%. In the OMD process, the vacuum can reach -0.1MPA, and the heating can reach 80-160 degrees. After the magnetic ink diaphragm and the molded part are vacuum-pressed and bonded, the ink is sealed between the molded part and the base film. The residual solvent in the ink is easy to boil and cause bubbles, resulting in poor appearance. The main resin in the common magnetic ink has no stretchability, and the slow-drying solvent is also prone to bubble problems.

[0033] The resin in the magnetic ink of the present invention mainly solves the problem of easy cracking of the ink in the OMD process by selecting some acrylic resins, vinyl chloride-vinyl acetate resins and other resins with good stretchability. The vacuum in the OMD process can reach -0.1MPA, and the heating can reach 80-160 degrees. After the magnetic ink diaphragm and the injection molded part are vacuum hot-pressed and laminated, the ink is sealed between the injection molded part and the base film. The residual solvent in the magnetic ink is easy to boil under low pressure conditions and cannot be released, resulting in bubbling and causing appearance bubbling defects. The present invention solves the problems of poor stretchability, cracking, bubbling, etc. in the application of magnetic ink in the OMD process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is the product structure diagram of the magnetic effect in the OMD mold decoration process.

[0035] Figure 2This is a picture of the workpiece product with water ripple magnetic texture prepared in Example 1.

[0036] Figure 3 This is a picture of the workpiece product with strip texture prepared in Example 2.

[0037] Explanation of the accompanying drawings: 1-base film, 2-ink, 3-glue, 4-workpiece. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0039] Example 1

[0040] Step 1: Select a water ripple magnetic texture;

[0041] Step 2: Print magnetic effect ink on the ABS diaphragm, form water ripples through a magnetic fixture, and bake at 60°C for 20 minutes; in parts by weight, the magnetic effect ink consists of 30 parts of acrylic resin, 60 parts of vinyl chloride-vinyl acetate resin, 3 parts of iron oxide magnetic powder, 8 parts of ethyl acetate, 8 parts of butanone and 1 part of an additive.

[0042] Step 3: Print a layer of black base ink Huaian Yincai HC-4688 on the magnetic effect ink and bake it at 60℃ / 90 minutes;

[0043] Step 4: Apply a layer of hot melt adhesive Kanglibang KL-18 on the black base ink and bake at 60℃ for 10 minutes;

[0044] Step 5: After the glue coating is completed, the injection molded part is placed on the fixture in a fixed position. At the same time, the ABS diaphragm coated with glue is laid and fixed;

[0045] Step 6: Soften the ABS film by heating it under vacuum, and lift the workpiece for preforming;

[0046] Step 7: Use a vacuum pressure differential laminating machine to attach the ABS diaphragm to the injection molded part. The temperature of the pressure differential molding is 120°C and the pressure of the pressure differential molding is 0.3MPa.

[0047] Step 8: Cut off the film not on the workpiece, trim the edges, and complete the out-of-mold decoration process method using magnetic effect of this embodiment.

[0048] Example 2

[0049] Step 1: Select a strip texture;

[0050] Step 2: Print magnetic effect ink on the PC film, form a strip texture through a magnetic fixture, and bake at 60°C / 20 minutes; by weight, the magnetic effect ink consists of 30 parts of acrylic resin, 60 parts of vinyl chloride-vinyl acetate resin, 3 parts of iron oxide magnetic powder, 8 parts of ethyl acetate, 8 parts of butanone and 1 part of additives.

[0051] Step 3: Print a layer of black base ink Huaian Yincai HC-4688 on the magnetic effect ink and bake it at 60℃ / 90 minutes;

[0052] Step 4: Apply a layer of hot melt glue Kanglibang KL-18 on the black base ink and bake at 60℃ / 10 minutes;

[0053] Step 5: After the glue coating is completed, the injection molded part is placed on the fixture in a fixed position. At the same time, the PC diaphragm coated with glue is laid and fixed;

[0054] Step 6: Heat under vacuum to soften the PC film, and lift the workpiece for preforming;

[0055] Step 7: Use a vacuum pressure differential laminating machine to laminate the PC film onto the injection molded part. The temperature of the pressure differential molding is 160°C and the pressure of the pressure differential molding is 0.3MPa.

[0056] Step 8: Cut off the film not on the workpiece, trim the edges, and complete the out-of-mold decoration process method using magnetic effect of this embodiment.

[0057] Example 3

[0058] Step 1: Select a water ripple magnetic texture;

[0059] Step 2: Print magnetic effect ink on the PC diaphragm, form water ripples through a magnetic jig, and bake at 60°C for 15 minutes; in parts by weight, the magnetic effect ink consists of 20 parts of acrylic resin, 50 parts of vinyl chloride-vinyl acetate resin, 2 parts of iron oxide magnetic powder, 5 parts of ethyl acetate, 5 parts of butanone and 1 part of an additive.

[0060] Step 3: Print a layer of black base ink Huaian Yincai HC-4688 on the magnetic effect ink and bake it at 60℃ / 60 minutes;

[0061] Step 4: Apply a layer of hot melt glue Kanglibang KL-18 on the black base ink and bake at 60℃ for 5 minutes;

[0062] Step 5: After the glue coating is completed, the injection molded part is placed on the fixture in a fixed position. At the same time, the PC diaphragm coated with glue is laid and fixed;

[0063] Step 6: Heat under vacuum to soften the PC film, and lift the workpiece for preforming;

[0064] Step 7: Use a vacuum differential pressure laminating machine to laminate the PC film onto the injection molded part. The temperature of the differential pressure laminating machine is 160°C and the pressure of the differential pressure laminating machine is 0.1MPa.

[0065] Step 8: Cut off the film not on the workpiece, trim the edges, and complete the out-of-mold decoration process method using magnetic effect of this embodiment.

[0066] Example 4

[0067] Step 1: Select a water ripple magnetic texture;

[0068] Step 2: Print magnetic effect ink on the PC diaphragm, form water ripples through a magnetic fixture, and bake at 60°C for 30 minutes; in parts by weight, the magnetic effect ink consists of 40 parts of acrylic resin, 70 parts of vinyl chloride-vinyl acetate resin, 4 parts of iron oxide magnetic powder, 10 parts of ethyl acetate, 10 parts of butanone, and 2 parts of additives.

[0069] Step 3: Print a layer of black base ink Huaian Yincai HC-4688 on the magnetic effect ink and bake it at 60℃ / 120 minutes;

[0070] Step 4: Apply a layer of hot melt adhesive Kanglibang KL-18 on the black base ink and bake at 60℃ / 8 minutes;

[0071] Step 5: After the glue coating is completed, the injection molded part is placed on the fixture in a fixed position. At the same time, the PC diaphragm coated with glue is laid and fixed;

[0072] Step 6: Heat under vacuum to soften the PC film, and lift the workpiece for preforming;

[0073] Step 7: Use a vacuum pressure differential laminating machine to laminate the PC film onto the injection molded part. The temperature of the pressure differential molding is 160°C and the pressure of the pressure differential molding is 0.4MPa.

[0074] Step 8: Cut off the film not on the workpiece, trim the edges, and complete the out-of-mold decoration process method using magnetic effect of this embodiment.

[0075] Effect evaluation 1

[0076] At present, the product has a strong three-dimensional appearance and rich colors. It can be made into different pattern effects such as water ripples, stripes, triangles, and patterns. The vacuum pressure difference coating after OMD process has no cracking, blistering and other appearance defects, and the appearance is good. The product can pass the pull-out test, high temperature and high humidity (50℃, 95%RH, 144H), 70℃ / 8H baking test.

[0077] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A method for out-of-mold decoration using magnetic effect, characterized in that: The steps include: S11: coating a magnetic effect ink on one surface of the polymer film; S12: forming a magnetic texture on the polymer film coated with the magnetic effect ink in step S11 through a magnetic fixture; S13: baking the polymer film formed with corrugations in step S12; S14: coating the side of the polymer film coated with the magnetic effect ink after the primary baking with the base color ink and then baking it for the second time; S15: coating glue on the side of the polymer film coated with the base color ink after the secondary baking; S16: The side of the polymer film coated with glue is adhered to the surface of the injection molded part through pressure difference molding, thereby completing the out-of-mold decoration process method using magnetic effect.

2. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: The material of the polymer membrane is selected from polyvinyl chloride, ABS, polycarbonate or polyolefin.

3. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: The magnetic effect ink comprises acrylic resin, vinyl chloride-vinyl acetate resin, iron oxide magnetic powder, ethyl acetate, butanone and an auxiliary agent.

4. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: The magnetic texture is selected from a water ripple magnetic texture or a strip texture.

5. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: In step S13, the baking temperature is 55-65° C. and the baking time is 15-30 minutes.

6. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: In the step S14, the secondary baking temperature is 55-65° C., and the baking time is 60-120 min.

7. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: In step S16, the pressure differential molding is performed using a vacuum pressure differential laminating machine.

8. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: In step S16, the temperature of the differential pressure forming is 80-160°C.

9. The method for out-of-mold decoration using magnetic effect as claimed in claim 1, characterized in that: In step S16, the pressure of differential pressure molding is 0.1-0.4 MPa.

10. An out-of-mold decoration workpiece prepared by the out-of-mold decoration process using magnetic effect as claimed in any one of claims 1 to 9.

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